Year	Cases per 100,000
1953	69.13
1954	63.24
1955	61.15
1956	58.71
1957	56.09
1958	54.99
1959	54.54
1960	50.7
1961	50.16
1962	48.8
1963	43.75
1964	45.41
1965	41.55
1966	39.57
1967	38.22
1968	40.04
1969	35.03
1970	33.95
1971	33.2725
1972	33.195
1973	32.1175
1974	29.87
1975	30.8025
1976	29.785
1977	29.0075
1978	28.46
1979	29.8825
1980	28.575
1981	28.4775
1982	26.63
1983	26.6525
1984	28.255
1985	27.4175
1986	24.77
1987	27.7525
1988	24.605
1989	25.4875
1990	25.59
1991	24.39
1992	23.13
1993	21.99
1994	20.85
1995	19.89
1996	19.21
1997	18.3
1998	17.49
1999	16.52
2000	15.78
2001	15.08
2002	14.62
2003	14.16
2004	13.55
2005	13.13
2006	12.76
2007	12.28
2008	11.88
2009	11.59
2010	11.26
2011	10.98
2012	10.73
2013	10.57
2014	10.39
2015	10.16
2016	10.01